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US20060030281A1 - Method for transmit power compensation in a mobile communication terminal and communication terminal for implementing said method - Google Patents

Method for transmit power compensation in a mobile communication terminal and communication terminal for implementing said method Download PDF

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Publication number
US20060030281A1
US20060030281A1 US10/534,005 US53400505A US2006030281A1 US 20060030281 A1 US20060030281 A1 US 20060030281A1 US 53400505 A US53400505 A US 53400505A US 2006030281 A1 US2006030281 A1 US 2006030281A1
Authority
US
United States
Prior art keywords
power
frequency
antenna
power amplifier
terminal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US10/534,005
Other languages
English (en)
Inventor
Roman Brunel
Markus Larkamp
Martin Oelschlager
Sheng-gen Pan
Reiner Pruchner
Reiner Schutze
Stefan Siebinger
Mark Skalski
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Assigned to SIEMENS AKTIENGESELLSCHAFT reassignment SIEMENS AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: PAN, SHENG GEN, SCHUTZE, REINER, BRUNEL, ROMAN, PRUCHNER, REINER, LARKAMP, MARKUS, SKALSKI, MZRK, SIEBINGER, STEFAN, OELSCHLAGER, MARTIN
Publication of US20060030281A1 publication Critical patent/US20060030281A1/en
Abandoned legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/30—Transmission power control [TPC] using constraints in the total amount of available transmission power
    • H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
    • H04W52/343—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading taking into account loading or congestion level
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/3827—Portable transceivers
    • H04B1/3833—Hand-held transceivers
    • H04B1/3838—Arrangements for reducing RF exposure to the user, e.g. by changing the shape of the transceiver while in use
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/005—Control of transmission; Equalising
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/30—Transmission power control [TPC] using constraints in the total amount of available transmission power
    • H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
    • H04W52/346—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading distributing total power among users or channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B2001/0408—Circuits with power amplifiers
    • H04B2001/0416—Circuits with power amplifiers having gain or transmission power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/52—Transmission power control [TPC] using AGC [Automatic Gain Control] circuits or amplifiers

Definitions

  • the present disclosure relates to a method for transmission power adjustments for a mobile communications terminal that is equipped with a power amplifier, whose output signal amplitude depends on the frequency of an input signal to the power amplifier, an RF connector, an internal antenna and a connection for an external antenna, and which is designed for operation in at least one standard mobile radio frequency band.
  • the disclosure also relates to a communications terminal by means of which the method for transmission power adjustment can be carried out.
  • the GSM specification stipulates what minimum RF output power must be available at an RF connector of a mobile communications terminal which not only has an internal antenna but is also designed for connection via the RF connector to an external antenna.
  • the antenna output power from the mobile communications terminal is frequency-dependent and channel-dependent.
  • adjustments have been made to the channel with the lowest power, so that it is possible to assume that all the channels satisfy the minimum GSM-specific power. This procedure leads to the SAR value being particularly high, for example for the channels located in the center of the frequency spectrum, assuming a typical profile for the frequency dependence of the emitted power.
  • the output signal amplitude of this configuration depends on the frequency of an input signal to the power amplifier, an RF connector, an internal antenna and a connection for an external antenna, and for operation in at least one standard mobile radio frequency band, wherein the at least one standard mobile radio frequency band is subdivided into two or more frequency intervals, and power adjustment is carried out for each of at least some of the frequency intervals.
  • frequency intervals are referred to as individual radio channels.
  • the present disclosure is based on specifying a method for power adjustment for a mobile communications terminal, in which the SAR value can be effectively optimized.
  • a further aim is to provide a communications terminal for carrying out the method.
  • the power adjustment is achieved by an exemplary method for transmission power adjustments for a mobile communications terminal, which is equipped with a power amplifier whose output signal amplitude depends on the frequency of an input signal to the power amplifier, an RF connector, an internal antenna and a connection for an external antenna, and which is designed for operation in at least one standard mobile radio frequency band, in which case the at least one standard mobile radio frequency band is subdivided into two or more frequency intervals, and one power adjustment operation is carried out in each case for at least some of the frequency intervals.
  • frequency adjustment is additionally carried out on a frequency-interval specific basis.
  • the frequency intervals may have the same constant width, or a varying width.
  • the power adjustment can be carried out either for all the frequency intervals into which the standard mobile radio frequency band is subdivided, or only for a number of frequency intervals, for which the emitted power from the antenna is particularly high, due to the frequency dependency of the antenna. This makes it possible to simultaneously satisfy not only any specifications for a mobile radio standard but also the requirements for an SAR value that is as low as possible.
  • the power adjustment for the frequency intervals can be carried out by accessing a reference table, in which an adjustment factor is associated with each frequency interval. These adjustment factors reflect the frequency profile on the power amplifier and, if appropriate the antenna characteristics.
  • the entries in the reference table may correspond to the reciprocal of a normalized frequency profile of the power amplifier. This makes it possible to reduce the SAR value for the given frequency interval at that time.
  • the power adjustment for the RF connector is preferably carried out as a function of whether the mobile communications terminal is operated with its own internal antenna or with an external antenna.
  • a reference table can be provided which ensures that an input signal whose amplitude is independent of frequency is produced at an input to the RF connector. As such, the appropriate specifications are taken into account.
  • an antenna detector to determine whether the mobile communications terminal is operating with its own internal antenna or with an external antenna, with the antenna detector responding, for example, when the internal antenna is being used, thus resulting in a situation in which the SAR value is of particular importance.
  • the power adjustment when using the internal antenna, can be carried out such that the emitted power level from the mobile communications terminal is essentially independent of the frequency of the input signal to the power amplifier.
  • the output power from a transmission antenna for the mobile communications terminal is independent of frequency. This has the advantage that, for example, weak channels at the edge of the standard mobile radio frequency band have their power increased, to produce an improved communication link for an uplink connection to a base station.
  • the power is adjusted in a particularly advantageous manner by giving priority to the optimization of the SAR value over the at least one standard mobile radio frequency band.
  • system and method in the present disclosure may, also be carried out for transmission power adjustment for a mobile communications terminal that can operate in two or more standard mobile radio frequency bands.
  • two or more reference tables for example, are provided, and are used in the manner described above.
  • the aforementioned power adjustment is achieved in a communications terminal by a mobile communications terminal having a power amplifier whose output signal amplitude depends on the frequency of the input signal to the power amplifier, and having a device for adjusting power for the output of the communications terminal in at least one standard mobile radio frequency band.
  • the device for power adjustment is preferably designed to adjust the output power for two or more frequency intervals in the at least one standard mobile radio frequency band.
  • One feature of the communications terminal is that the required means for respective power adjustment are provided for individual frequency intervals in a standard mobile radio frequency band. These means may be the reference table, disclosed above.
  • the use of an antenna detector allows different reference tables to be used for power adjustment for different operating conditions of the mobile communications terminal, with the operating conditions being distinguished on the basis of whether the antenna is external or internal.
  • FIG. 1 illustrates a frequency profile of the emitted power from an antenna for a mobile communications terminal with a standard input signal amplitude
  • FIG. 2 is a schematic block diagram of a transmission output stage of a mobile communications terminal, by means of which power adjustment can be carried out for individual frequency intervals, and
  • FIG. 3 illustrates an exemplary reference table for a triband communications terminal.
  • the output power I of an antenna AI is dependent on frequency, assuming that the input signal amplitude to the power amplifier remains constant.
  • FIG. 1 shows a total of six frequency intervals, each indicating different mean output power levels, with the frequency interval 4 containing the power maximum. Power adjustment is carried out individually for each of the frequency intervals 1 to 6 . This power adjustment is carried out such that an SAR value which is as constant as possible is set for all of the frequency intervals 1 to 6 .
  • the frequency profile, which results after the power adjustment, for the amplitude of the output signal from the power amplifier PA is also illustrated in FIG. 1 , by means of a dashed-dotted line. This clearly shows that the power adjustment results in an increase in the power for the frequency intervals or mobile radio channels 1 and 6 , which are weak, so that they have a better signal-to-noise ratio when used in an uplink connection to a base station in a mobile radio network.
  • the separate power adjustment for all six frequency intervals furthermore means that the power that is emitted from an antenna A, and is based on the amplitude of the output signal from the power amplifier PA is reduced for particularly strong channels, such as the channels or frequency intervals 3 and 4 in FIG. 1 , thus resulting in a reduction in the associated SAR value. In comparison to conventional systems, this results in a reduction in the SAR value for the strongest channels or frequency intervals on which the mobile communications terminal is operating.
  • the power can be increased until the associated SAR value is slightly below a predetermined maximum SAR value, with a value range (which is predetermined by the relevant mobile radio specification) for the channel power being taken into account as a boundary condition.
  • a value range which is predetermined by the relevant mobile radio specification
  • FIG. 2 shows one exemplary embodiment of a method for carrying out a power adjustment.
  • An output signal from power amplifier PA is passed to RF connector K, whose output signal is supplied to internal antenna AI.
  • antenna AI is connected to antenna detector D, which continuously emits the power that is emitted from antenna AI.
  • antenna detector D detects that the mobile terminal is operating in an operating state with internal antenna AI, it will send a signal to reference table V 2 .
  • Reference table V 2 selects frequency-dependent power Adjustment, where values for RF connector K are stored in a reference table V 1 .
  • Reference table V 2 is accessed when antenna detector D detects that internal antenna AI for the mobile communications terminal is being used, whose radiated power is relied upon for obtaining a SAR value.
  • the reference table V 1 contains adjustment values for the power amplifier PA which, in the end, lead to the emitted power from the communications terminal being substantially constant over the standard mobile radio spectrum that is being used at that time.
  • reference table V 1 is accessed.
  • the adjustment values of reference table V 1 are designed such that they ensure that the RF power which is provided by the power amplifier PA at an input to the RF connector is independent of frequency.
  • the adjustment factors in reference table V 2 are chosen such that the SAR value is slightly below the predetermined maximum SAR value for all of the frequency intervals.
  • the adjustment factors that are required for this purpose may be determined empirically.
  • FIG. 3 shows one example of the reference table V 2 , with the reference table V showing a total of three standard mobile radio frequency bands, namely GSM 900, DCS 1800 and PCS 1900. Each of these frequency bands is subdivided into a total of ten groups, with the start frequency, the end frequency, the difference frequency between the end frequency and the start frequency and the center frequency being specified for each group. Each individual group in the reference table V 2 has an associated adjustment value, that is obtained empirically, for example as a function of characteristics of the power amplifier and of the antenna, or of further circuit elements.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)
  • Mobile Radio Communication Systems (AREA)
US10/534,005 2002-11-05 2003-10-15 Method for transmit power compensation in a mobile communication terminal and communication terminal for implementing said method Abandoned US20060030281A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10251465.8 2002-11-05
DE10251465A DE10251465A1 (de) 2002-11-05 2002-11-05 Verfahren zum Sendeleistungsabgleich bei einem mobilen Kommunikationsendgerät und Kommunikationsendgerät zur Durchführung des Verfahrens
PCT/DE2003/003425 WO2004042946A1 (de) 2002-11-05 2003-10-15 Verfahren zum sendeleistungsabgleich bei einem mobilen kommunikationsendgerät und kommunikationsendgerät zur durchführung des verfahrens

Publications (1)

Publication Number Publication Date
US20060030281A1 true US20060030281A1 (en) 2006-02-09

Family

ID=32115232

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/534,005 Abandoned US20060030281A1 (en) 2002-11-05 2003-10-15 Method for transmit power compensation in a mobile communication terminal and communication terminal for implementing said method

Country Status (7)

Country Link
US (1) US20060030281A1 (zh)
EP (1) EP1559202B1 (zh)
KR (1) KR20050072134A (zh)
CN (1) CN1711701B (zh)
DE (2) DE10251465A1 (zh)
TW (1) TW200412047A (zh)
WO (1) WO2004042946A1 (zh)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050274799A1 (en) * 2004-06-10 2005-12-15 Zih Corp. Apparatus and method for communicating with an RFID transponder
US20060120330A1 (en) * 2004-12-06 2006-06-08 Pantech Co., Ltd. Method of converting communication channel in mobile communication terminal
US20100317302A1 (en) * 2009-06-12 2010-12-16 Novatel Wireless System and method for controlling rf explosure levels
US9300343B2 (en) 2012-05-03 2016-03-29 Hewlett-Packard Development Company, L.P. Controlling electromagnetic radiation from an electronic device
US9852318B2 (en) 2003-08-29 2017-12-26 Zih Corp. Spatially selective UHF near field microstrip coupler device and RFID systems using device
US10326486B2 (en) * 2017-08-03 2019-06-18 Dell Products, Lp Methods and apparatus for dynamic control of specific absorption rate
CN111956387A (zh) * 2020-07-16 2020-11-20 未来穿戴技术有限公司 按摩设备的控制方法及按摩设备、计算机可读存储介质

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100426682C (zh) * 2005-07-19 2008-10-15 中兴通讯股份有限公司 一种功率校准的方法
JP2009253479A (ja) * 2008-04-02 2009-10-29 Sony Ericsson Mobilecommunications Japan Inc 携帯通信端末及びその送信特性制御方法
US9300342B2 (en) * 2013-04-18 2016-03-29 Apple Inc. Wireless device with dynamically adjusted maximum transmit powers
CN116683928A (zh) * 2023-05-16 2023-09-01 成都欧珀通信科技有限公司 射频系统和通信设备

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US5048117A (en) * 1988-02-29 1991-09-10 Kabushiki Kaisha Toshiba Radio telephone apparatus
US5884149A (en) * 1997-02-13 1999-03-16 Nokia Mobile Phones Limited Mobile station having dual band RF detector and gain control
US6115587A (en) * 1997-01-31 2000-09-05 Samsung Electronics Co., Ltd. Radio signal power control method according to variation of frequency and temperature in paging transmitter
US20020055338A1 (en) * 2000-10-09 2002-05-09 Alcatel Device and a method for controlling and monitoring the power of the signal from a radiocommunications terminal
US20030064761A1 (en) * 2001-09-28 2003-04-03 Siemens Information And Communication Mobile Llc System and method for reducing SAR values
US6580901B1 (en) * 1998-12-18 2003-06-17 Nec Corporation Burst-type transmission output power control apparatus capable of reducing phase errors
US6591106B1 (en) * 1997-11-25 2003-07-08 Siemens Aktiengesellschaft Transmission system for transmitting digital signals in a radio subscriber terminal network
US20040046701A1 (en) * 2001-03-07 2004-03-11 Stefan Huber Radio communications device comprising an sar value-reducing correction element
US6792296B1 (en) * 2002-10-01 2004-09-14 Motorola, Inc. Portable wireless communication device and methods of configuring same when connected to a vehicle
US20040203369A1 (en) * 2002-08-30 2004-10-14 Auden Techno Corp. Device for radio communication equipment to reduce electromagnetic energy absorbency of a human body
US6985751B2 (en) * 2002-03-07 2006-01-10 Siemens Communications, Inc. Combined open and closed loop power control with differential measurement
US7099632B2 (en) * 2002-08-30 2006-08-29 Choong-Sheek Hong Wireless phone having improved SAR

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JPH02285817A (ja) * 1989-04-27 1990-11-26 Nec Corp 無線送信機
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US6337975B1 (en) * 1999-04-02 2002-01-08 Qualcomm Inc. System and method for power measurement in outdoor antenna units
AU2001259495A1 (en) * 2000-05-04 2001-11-12 Matsushita Mobile Communications Development Corporation Of U.S.A. Output power control of a transmitter

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Publication number Priority date Publication date Assignee Title
US5048117A (en) * 1988-02-29 1991-09-10 Kabushiki Kaisha Toshiba Radio telephone apparatus
US6115587A (en) * 1997-01-31 2000-09-05 Samsung Electronics Co., Ltd. Radio signal power control method according to variation of frequency and temperature in paging transmitter
US5884149A (en) * 1997-02-13 1999-03-16 Nokia Mobile Phones Limited Mobile station having dual band RF detector and gain control
US6591106B1 (en) * 1997-11-25 2003-07-08 Siemens Aktiengesellschaft Transmission system for transmitting digital signals in a radio subscriber terminal network
US6580901B1 (en) * 1998-12-18 2003-06-17 Nec Corporation Burst-type transmission output power control apparatus capable of reducing phase errors
US20020055338A1 (en) * 2000-10-09 2002-05-09 Alcatel Device and a method for controlling and monitoring the power of the signal from a radiocommunications terminal
US20040046701A1 (en) * 2001-03-07 2004-03-11 Stefan Huber Radio communications device comprising an sar value-reducing correction element
US20030064761A1 (en) * 2001-09-28 2003-04-03 Siemens Information And Communication Mobile Llc System and method for reducing SAR values
US6985751B2 (en) * 2002-03-07 2006-01-10 Siemens Communications, Inc. Combined open and closed loop power control with differential measurement
US20040203369A1 (en) * 2002-08-30 2004-10-14 Auden Techno Corp. Device for radio communication equipment to reduce electromagnetic energy absorbency of a human body
US7099632B2 (en) * 2002-08-30 2006-08-29 Choong-Sheek Hong Wireless phone having improved SAR
US6792296B1 (en) * 2002-10-01 2004-09-14 Motorola, Inc. Portable wireless communication device and methods of configuring same when connected to a vehicle

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9852318B2 (en) 2003-08-29 2017-12-26 Zih Corp. Spatially selective UHF near field microstrip coupler device and RFID systems using device
US9613242B2 (en) 2004-06-10 2017-04-04 Zih Corp. Apparatus and method for communicating with an RFID transponder
US20120038951A1 (en) * 2004-06-10 2012-02-16 Zih Corp. Apparatus and method for communicating with an rfid transponder
US8544740B2 (en) * 2004-06-10 2013-10-01 Zih Corp. Apparatus and method for communicating with an RFID transponder
US8596532B2 (en) 2004-06-10 2013-12-03 Zih Corp. Apparatus and method for communicating with an RFID transponder
US20050274799A1 (en) * 2004-06-10 2005-12-15 Zih Corp. Apparatus and method for communicating with an RFID transponder
US7567530B2 (en) * 2004-12-06 2009-07-28 Pantech Co., Ltd. Method of converting communication channel in mobile communication terminal
US20060120330A1 (en) * 2004-12-06 2006-06-08 Pantech Co., Ltd. Method of converting communication channel in mobile communication terminal
US20100317302A1 (en) * 2009-06-12 2010-12-16 Novatel Wireless System and method for controlling rf explosure levels
WO2010144620A1 (en) * 2009-06-12 2010-12-16 Novatel Wireless, Inc. System and method for controlling power levels
US9300343B2 (en) 2012-05-03 2016-03-29 Hewlett-Packard Development Company, L.P. Controlling electromagnetic radiation from an electronic device
US10326486B2 (en) * 2017-08-03 2019-06-18 Dell Products, Lp Methods and apparatus for dynamic control of specific absorption rate
CN111956387A (zh) * 2020-07-16 2020-11-20 未来穿戴技术有限公司 按摩设备的控制方法及按摩设备、计算机可读存储介质

Also Published As

Publication number Publication date
DE10251465A1 (de) 2004-05-19
DE50304787D1 (de) 2006-10-05
CN1711701B (zh) 2010-06-23
CN1711701A (zh) 2005-12-21
WO2004042946A1 (de) 2004-05-21
TW200412047A (en) 2004-07-01
EP1559202A1 (de) 2005-08-03
EP1559202B1 (de) 2006-08-23
KR20050072134A (ko) 2005-07-08

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